COMrOSIT.E. (COMI'OSITK FAMILY.) 233 



scales of the involucre linear, acute or rather obtuse, imlH-iciitcd in 3 or 4 rows. — 

 Thickets, Helds, &c. : very common, and c.xtcn.sivcly variahle. — Leaves larj^cr 

 than in either of the precedin;; (^' -.')') ; tiie involucre intermediate between 

 tlicni, as to the forn.\ of tiie scales. Kays mostly short, pale bluish-purple or 

 white. 



H- H- I/,a<ls mul.lli-sizrd. (Incolucre 3" - .')" /o»</.) 



22. A. simplex, Willd. Smooth or nearly so (3° - 6° high), much 

 branched; t\n: brumhi a and scattered heads somewhat corifmhose at the summit; 

 Uai-es lanceolate, pointed, the louxr serrate ; scales of the involucre linear-aui-shaped, 

 looselj and sjxirinyli/ imbricated. — Shady moist banks : common. — Rays pale. 

 Approaches in its different forms the preceding and the two following. 



23. A. tenuifblius, L. Nearly smooth; stem much branched (2° -3° 

 high); the heads sumewluit i)aiiicled or raeemcd ; leaves narrowli/ lanceolate, 

 tapering into a lomj slender point (2'- 6' long), with rough margins, the lower some- 

 what serrate in the middle ; scales of the hemispherical involucre linear-awl-shaped, 

 verij slender-pointed, numerous, closelij imbricuted. — Low grounds. New York to 

 Wisconsin, and .southward. Kays short and narrow, ])ale purple or whitish. 



24. A. CarneUS, Nees. Smooth, or the branches rough or pubescent; 

 leaves lanciolute, somewhat pointed, or the upjier short and partly clasping; 

 heads racemose along the ascending leafy branches ; scales of the obovate in- 

 volucre lanceolate, abruptly acute, closely imbricuted. — Moist soil : common. Leaves 

 firm in texture, smooth, or rough above. Kays rather large, bluish, purplish, 

 violet-purple, or almost white. — On a thorough revision of the genus, older 

 names will be found and verified for this and No. 22, which here cover a multi- 

 tude of forms. A muta'bilis, L., is probably one of them. 



» « jK * * * Stem-leaves sessile, the upper more or bss rldspliH/ : scales of the hemi- 

 sjiherical involucre loosely more or less imbricated, somew/iut ecjual, ivith herba- 

 ceous tips, or the outer often entirety herbaceous: heads middle-sized or large: 

 rays blue or pur/ile. (The species of this group are still perplexing.) 



2.5. A. SestiVUS, Ait. Stem slender, roui/h, bushy-branched ; leaves nar- 

 rowly lanceolate-linear, elongated, taper-pointed, entire, with rough nuirgins; heads 

 corymbose, loose ; scales of the involucre linear, loose ; rays large, apparently light 

 blue. (A. laxifblius, Nees.) — Var. L.KTiFL6nus has very slender branches 

 and leaves, and the scales of the involucre unequal and more appressed. — 

 Moist shady places, Ohio to Wisconsin and northward. — Heads about as large 

 as in A. puniccus, in some forms ap])earing more like A. carueus. Leaves 4'- 

 7' long, \' to i' wide. 



2G. A. Novi-B61gii, L. Nearly smooth ; stem stout ; leaves oblong-lanceo- 

 late, pale or somewhat glaucous, serrate in the middle, acute, tajiering to each end ; 

 scales of the involucre rather closely imbricated, with bro<idi.th acute herbaceous tips; 

 rays j)ale blue or purplish. — Low grounds, not clearly known in a wilil state. 

 The plant here in view is intermediate between No. 24 and No. 27. — Heads 

 smaller and less ^liowy tiian in the next. 



27. A. lougif61iuS, Lam. Smmith or nearly so ; stem branclicd, corym- 

 bose-panicled at the summit; /((fCLs/dHfro/f/^'or //;(«;»-, or the lower ovate-lanceo- 

 late, entire or sparinglv serrate in the middle, taper-pointed, shining above; scales 

 L & M— 30 



